Malicious PDF — malware analysis report

Static analysis result for SHA-256 8124461f501406ed…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 19:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 678d52be65c5da51eebaf9020b1beb35 SHA-1: c8783957eab9a0575540e6380c451dcf54c3740f SHA-256: 8124461f501406ed39bb4a77d929b44edd6a8cafdda73dd04912a531b94b820c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards the document being used to drive traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=schwinn+220+recumbent+bike+owner%2527s+manual PDF link annotation
    • https://tanedozuwo.weebly.com/uploads/1/3/4/6/134644204/6f651dac86314.pdfIn PDF document text
    • https://sofirutowik.weebly.com/uploads/1/3/1/3/131381411/pufobiranute_fekuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72516967-99ee-44d6-ab60-7cb0917b61e8/46636554349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2136d7ff-1134-4dd1-bd29-908b9c8497fc/69984777066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc869c57-06db-431c-864c-a468adedd78a/brinkmann_smokers_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adec32d2-762d-4500-a686-22b525e07844/39223663299.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/healthy_vegetable_recipes_for_picky_eaters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987f63a2-6755-4320-a9e4-8e33b3d54efd/how_to_stack_a_maytag_washer_and_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff03f05d-690c-4af9-a19c-350dbe0d98db/how_to_cancel_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3180ba9a-bc7e-4119-8dc9-7464a800a038/67970039516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac6b7c6-3755-4fb3-b310-3ed88596f127/pazelenisaxupiguwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72703a93-d91f-4058-870b-2e223e88b447/indian_navy_iti_jobs_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/986e5eb6-51c3-4e57-af9e-b69c9f8949ea/harbor_breeze_santa_ana_ceiling_fan_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce943688-3d9c-47b1-a358-808baf789492/how_do_i_light_the_pilot_on_my_wall_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa3d8cb-c13f-4925-8eac-6ddbc71277ce/is_rumpelstiltskin_really_gone.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/no_fodmaps_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b7d436-601e-44c3-bf05-a85e7c20929c/werilinukode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f360e2ab-583c-4a57-860a-9a5c365a6172/19842742101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facfbe06-6597-42a6-b036-722503ab13f1/4_qt_crock_pot_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/el_seor_de_las_moscas_sinopsis_libro.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5744 bytes
SHA-256: a85368c16a7e7680f049da5b4f2b34e6b5658cceed59f7e0b7ee68319ebeb24a
font_01_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10764 bytes
SHA-256: b2c2f19ff4bfca213507ca4586783bec2b6e0af1128b46b2ecd4978e6caef1fc

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